Author: hselasky
Date: Mon Jan 9 16:55:29 2017
New Revision: 311791
URL: https://svnweb.freebsd.org/changeset/base/311791
Log:
MFC r310387:
Add more comments regarding collection of statistics counters.
Sponsored by: Mellanox Technologies
Modified:
stable/10/sys/dev/mlx5/mlx5_en/mlx5_en_main.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/dev/mlx5/mlx5_en/mlx5_en_main.c
==============================================================================
--- stable/10/sys/dev/mlx5/mlx5_en/mlx5_en_main.c Mon Jan 9 16:52:35
2017 (r311790)
+++ stable/10/sys/dev/mlx5/mlx5_en/mlx5_en_main.c Mon Jan 9 16:55:29
2017 (r311791)
@@ -306,6 +306,12 @@ mlx5e_update_carrier_work(struct work_st
PRIV_UNLOCK(priv);
}
+/*
+ * This function reads the physical port counters from the firmware
+ * using a pre-defined layout defined by various MLX5E_PPORT_XXX()
+ * macros. The output is converted from big-endian 64-bit values into
+ * host endian ones and stored in the "priv->stats.pport" structure.
+ */
static void
mlx5e_update_pport_counters(struct mlx5e_priv *priv)
{
@@ -319,20 +325,27 @@ mlx5e_update_pport_counters(struct mlx5e
unsigned x;
unsigned y;
+ /* allocate firmware request structures */
in = mlx5_vzalloc(sz);
out = mlx5_vzalloc(sz);
if (in == NULL || out == NULL)
goto free_out;
+ /*
+ * Get pointer to the 64-bit counter set which is located at a
+ * fixed offset in the output firmware request structure:
+ */
ptr = (const uint64_t *)MLX5_ADDR_OF(ppcnt_reg, out, counter_set);
MLX5_SET(ppcnt_reg, in, local_port, 1);
+ /* read IEEE802_3 counter group using predefined counter layout */
MLX5_SET(ppcnt_reg, in, grp, MLX5_IEEE_802_3_COUNTERS_GROUP);
mlx5_core_access_reg(mdev, in, sz, out, sz, MLX5_REG_PPCNT, 0, 0);
for (x = y = 0; x != MLX5E_PPORT_IEEE802_3_STATS_NUM; x++, y++)
s->arg[y] = be64toh(ptr[x]);
+ /* read RFC2819 counter group using predefined counter layout */
MLX5_SET(ppcnt_reg, in, grp, MLX5_RFC_2819_COUNTERS_GROUP);
mlx5_core_access_reg(mdev, in, sz, out, sz, MLX5_REG_PPCNT, 0, 0);
for (x = 0; x != MLX5E_PPORT_RFC2819_STATS_NUM; x++, y++)
@@ -341,20 +354,29 @@ mlx5e_update_pport_counters(struct mlx5e
MLX5E_PPORT_RFC2819_STATS_DEBUG_NUM; x++, y++)
s_debug->arg[y] = be64toh(ptr[x]);
+ /* read RFC2863 counter group using predefined counter layout */
MLX5_SET(ppcnt_reg, in, grp, MLX5_RFC_2863_COUNTERS_GROUP);
mlx5_core_access_reg(mdev, in, sz, out, sz, MLX5_REG_PPCNT, 0, 0);
for (x = 0; x != MLX5E_PPORT_RFC2863_STATS_DEBUG_NUM; x++, y++)
s_debug->arg[y] = be64toh(ptr[x]);
+ /* read physical layer stats counter group using predefined counter
layout */
MLX5_SET(ppcnt_reg, in, grp, MLX5_PHYSICAL_LAYER_COUNTERS_GROUP);
mlx5_core_access_reg(mdev, in, sz, out, sz, MLX5_REG_PPCNT, 0, 0);
for (x = 0; x != MLX5E_PPORT_PHYSICAL_LAYER_STATS_DEBUG_NUM; x++, y++)
s_debug->arg[y] = be64toh(ptr[x]);
free_out:
+ /* free firmware request structures */
kvfree(in);
kvfree(out);
}
+/*
+ * This function is called regularly to collect all statistics
+ * counters from the firmware. The values can be viewed through the
+ * sysctl interface. Execution is serialized using the priv's global
+ * configuration lock.
+ */
static void
mlx5e_update_stats_work(struct work_struct *work)
{
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